Press having spring-pressed blank holder



Sept. 4, 1923.

Filed July 7 1921 3 Sheets-Sheet 1 W. KLOCKE PRESS HAVING SPRING PRESSED BLANK HOLDER Sept. 4, 1923;

Filed July 1921 3 Sheets-Sheet 2 $51 affouwl J se tf4, 1923.

w. KLOCKE PRESS HAVING SPRING PRESSED BLANK HOLDER Filed July 7, 1921 3 Sheets-Sheet 3 so combined or appilIieTL:

Sept, e is.

WILJDIAIM KLOCKE, OF WOODHAVEN', NEW YORK, ASSIG-NOR TO B. W. BLISS. COMP, 0F BROOKLYN, LNEW YORK, A CORPORATION WEST VIRGINIA.

:* HAVING BPBIN'G-PBESSED B HOLDER.

Application filed July '1, 1921. Serial No. 488,169;

To all whom it may concern:

Be it known that 1, WILLIAM KLOCKE, a citizen of theUnited States of America, re-

siding in WoOdhavenQ in the county of Queens, city and State of New York, have invented certain new and useful Improve-' tiall uniform resistance to the blank holder is o a simple and compact form, is readily applied to existing presses, and does not encumber the spacea'round the press, when The invention rtiher provides a novel combination and subcombinations herein more fully set forth.

Two embodiments illustrated in the which Figure 1 is'a view partly in side elevation, and partly in section, of a press embodying the invention;

of theinvention are accompanying drawings, 1n

" Figure 2 is a section at right angles to the section in Figure 1, the parts being shown on a somewhat enlargedcscale, and

Figure 3 is a view similar to :Fig. 2 showing a second embodiment of the invention.

Referring to said drawings, numeral 10 designates-the blank-holder, and 12 and 14 respectively a die and. punch coacting to shape a metal blank X clamped between the blank-holder and die, the die bein here shown as beingcarried by and movab e with a reciprocating slide 16 driven in any suitable manner as by a crank-shaft 18.

20 designates an elastic part, here shown as a rubber spring or body, for resisting the movement of said blank-holder, and 22 designates means for counteracting the inc '20 through a sliding plate 49.

in resistance of said elastic part 20 upon-- movement of said blank-holder 10. I

The elastic part 20 and the counteracting means 22 are preferably arranged in a group or ensemble on or around the axis of movement of the blank holder 10, the parts being usually arranged at the underside of the press, between the side frames, and in such manner that none of the parts projects beyond the outside dimensions of the press.

The elastic part 20, and associated parts, are conveniently carriedupon a hanger 25, conveniently in the form of a rod attached at its'upperend to the underside of the bed plate of the press. The elastic part 20 is conveniently arranged around the rod 25, and the force imparted to the'said elastic part is conveniently sustained by an abutment 28, the abutment 28 being preferably connected to the lower part or end of they rod 25 by means of a sleeve 29 and a nut 30,, the sleeve 29 and nut 3O being preferably connected by screw-threads 31. The lower end of the nut 31 is fastened to the rod 25 by means of the nut 33 engaging threads 34 on said rod 25. The counteracting means 22 preferably comprises one or more levers 40, conveniently'in the form of a bell crank, turnin on a suitable fulcrum or fulcrums 42, an having a connection or connections to the blank-holder 10, conveniently through a link or links 44, a plate 45 and pins or studs 47 between said blank-holder and plate 45.

The force of the lever or levers 40 is conveniently transmitted to the resilient part The fulcrum or fulcrums 42 are preferably so constructed as to shift during the movement of the lever or levers 40, in such manner thatthe ratio of the moments-47 and 48 increases as the levers 40 move under the force imparted thereto by the blankholder 10, and consequently as the resistance of the resilient part 20 increases, thereby serving to counteract the reaction on the blank-holder- 10 of the increase in the resistance of the said elastic part 20, and the lever 40 is preferably so arranged that this countel-acting effect, in conjunction with l theelastic part 20, isisuch as to provide a substantially uniform resistance of the blank holder 10, throughout its movement during the drawing of the blank. The moment 47 is preferably arranged to increase, and the moment 48 to decrease as the lever 40 moves under the action of the said blank-holder 10. ,The pressure on the fulcrum 42 is conveniently supported by the nut on the lower end or part of the rod 25, the said nut 30 thus constituting an abutment for the fulcrum at the lower end of the hanger.

The means for effecting 'the shifting of the fulcrum 42 may be of any suitable character, being preferably in the form of a link 50 connected to a bracket 52 bearingupon the nnt 30, as shown in Figure 2, or in the form of a bracket 54 having a surface 55 on which the said lever slides, as

shown in Figure 3. The contact between the lever 40, and the surface 55 is, however, conveniently through a roller 57.

The levers 40 and associated parts are preferably plural,'and in such construction the brackets 52 and 54 are formed separate from the nut 30, and the contacting faces are preferably spherical, so that the plates 52 and 54 may have a universal movement on the nut or abutment 30, and thereby equalize the application of the force transmitted through the levers 40 to the resilient part 20.

Operation: When the forming part or die 12 comes into contact with the blank X, margin of the blank is gripped between the said part 12 and the blank-holder 1 0,

and the blank-holder 10 moving against the resistance of the elastic part 20 is gripped or pressed against a die 12 with the force of said resilient part-20. As the blankholder 10 moves under the action of the die 12, the elastic part 20 will be compressed, thereby increasing the reaction or resistance of the said elastic part. This increased resistance is not transmitted to the blank-holder, however, by reason of the change in the ratio of the moments of the levers 40 as the levers turn, the arrangement being such that a substantially con stant force applied at the blank-holder side of the fulcrum, will move or overcome the regularly increasing resistance of the clastic part 20. Therefore, throughout the drawing of the blank X, its margin is gripped with a substantially uniform pressure throughout the action of the forming parts 12 and 14. I

The initial tension of the elastic part 20 may be varied, Without altering the position of the levers 40, by turning the nut 30 in a direction to draw the sleeve 29 and abutment 28 towards said nut 30. The

lever 40, and links 44 and 50 during this adjustment will be locked against turning owing to the straightness of the thrust through the joints, and the inter-relation of the forces tending toward any movement of the plate 49 away from the abutment 28.

The invention herein set forth may receive other embodiments than those herein specifically illustrated and described.

What I claim is 1. A- drawing press comprising a blankholder, and means for resisting the movement of said blank-holder, said means comprising an elastic part, an abutment against which said elastic part bears, an abutment on the side of said elastic part opposite said first abutment, a lever having its fulcrum supported on said second named abutment and adapted to transmit force applied thereto by said blank-holder to said elastic part, anda connection between said lever and blank-holder.

2. A drawing press comprising a blankholder, and means for resisting the movement of said blank-holder, said means comprising an elastic part, an abutment against said first abutment, a lever having its fulcrum supported on said second named abutment and adapted to transmit force applied thereto by said blank-holder to said elastic part, a connection between said lever and blank-holder, and means for moving said first named abutment without. altering the position of said second named abutment to adjust the initial tension of said elastic part.

3; A drawing press comprising a blankholder, and means for resisting the move ment of said blank-holder, said means comprising an elastic part, an abutment against which said elastic part bears,-'an abutment on the side of said elastic part opposite said first abutment, a lever having its fulcrum supported on said second'named abutment and adapted to transmit force applied thereto by said blank-holder to said elastic part, and a connection between said lever and blank-holder, said connection between said blank-holder and lever being around said elastic body, said elastic body being suspended substantially in line with the line of movement of said blank-holder.

5. A' drawing press comprising a blankholder, and means for resisting the movement of said blank-holder, said means comprising an elastic part, an abutment against which said elastic part bears, an abutment on the side of said elastic part opposite said first abutment, a lever having its fulcrum supported on said second named abutmentand adapted to transmit force applied thereto by said blank-holder to said elastic part, and a connection between said lever and blank-holder, said lever being so arranged that its moment on the elastic part side of the fulcrum decreases as the said lever is moved'to compress said elastic part.

6. A drawing press comprising a blankholder, and means for resisting the movement of said blank-holder, said means com prising an elastic part, an abutment against which said elastic part bears, an abutment: on. the side of said elastic part opposite said; first abutment, a lever having its fulcrum supported on said second named abutment and adapted to transmit force applied thereto by said blank-holder to said elastic part, and a connection between said lever and blank-holder, said lever being so arranged that its moment between the fulcrum and the point at which force is applied .to said elastic part decreases, and its moment between the fulcrum and the blankholder connection increases, as the said lever is moved to increase the tension of said elastic part. I

7. A drawing press comprising a blankholder, and means for resisting the movement of said blank-holder, said means comprising an elastic part, an abutment against which said elastic part bears, an abutment on the side of said elastic part opposite said first abutment, a lever having its fulcrum supported on said second named abutmeirt' and adapted to transmit force applied thereto by said blank-holder to said elaic part, and a connection between said lever and blank-holder, said lever having a shift ing fulcrum.

8. A drawing prem comprising a blankholder, and means for resisting the move ment of said blank-holder, said means comprising an elastic part, an abutment against which said elastic part bears, an abutment on the side of said elastic part opposite said. first abutment, a lever having its fulcrum supported on said mend named abutment and adapted to transmit force applied thereto by said blank-holder to said elastic part, and a connection between said lever and blank-holder, said lever having a shifting fulcrum, said shifting fulcrum compris ing a link connected to said second abutment. w

9. A drawing press comprising a blankholder, and means for resisting the move ment of said blank-holder, said means comprising an elastic part, an abutment against part.

thereto by said blank-holder to said elastic part, and a connection between said lever and blank-holder, said lever having a shifting fulcrum and beingin the form of a bellcrank. v

10. A drawing press comprising a blankholder, and means for resisting the movement of said blank-holder, said means comprising an elastic part, an abutment against which said elastic part bears, an abutment on the side of said elastic part opposite said first named abutment, a plurality of levers having their fulcrums supported on said second named abutment and adapted to transmit force applied thereto by said blank-holder to said elastic part, connections between said levers and blank-holder, and means for equalizing the pressures transmitted by said levers.

11. A drawing press comprising a blankholder, and means for resisting the'move-- ment of said blank-holder, said means com prising an elastic part, an abutment against which said elastic part bears, an abutment -0n the side of said elastic part opposite said prising an elastic part, a plurality of levers adapted to transmit the movement of said blank-holder to said elastic part, said levers having shiftable fulcrum supports providing means for equalizing the pressures transmitted by said levers to said elastic 13. A drawing press comprising a blankholder, and means for resisting the movement of said blank-holder, said means comprising an elastic part, a hanger for supporting said elastic part, said elastlc part having its axis of movement parallel to the axis of said hanger, a sliding plate bearing against the lower side of said elast c part, and means for transmitting the motion of said blank-holder to said sliding plate.

14. A drawing press comprising a blankholder, and means for resisting the move ment of said blank-holder, said means com-- prising an elastic part, a hanger for sup porting said elastic part saidaelastic part 7 having its axis of movement parallel to the axis of said hanger, a sliding plate bearing against they lower side of said elastic part, and means for transmittin the motion of said blank-holder to said sliding plate, said means comprising a lever havin a shifting fulcrum, w ereby the ratio of emoments increases in favor of the moving force of the blank-holder with increase of resistance of said elastic body.

15. A drawing press comprising a blankholder, and means for resisting the movement of said blank-holder, said means comprising an elastic part, a hanger for supporting said elastic part, a sliding plate bearing against the lower side of said elastic part, and means for transmittin the motion of said blank-holder to said sliding plate, said means comprising a lever adapted to transmit force applied thereto by said blankholder to said elastic part, said lever having a shifting fulcrum, whereby the ratio of the moments increases in favor of the moving force of the blank-holder with increase of resistance of said elastic bod said hanger having an abutment below sai sliding plate and .said lower abutment sustaining, the force on said fulcrum.

16. A drawing press comprising a blankholder, and means for resisting the movement of said blank-holder, said means comprising an elastic part, a hanger for supporting said elastic part, said elastic part having its axis of movement parallel to the axis of said hanger, a sliding plate bearing against the lower side of said elastic part, and means for transmitting the motion of said blank-holder to said sliding plate, said hanger comprising an abutment.

at its lower end for sustaining the forcepn said fulcrum, and an abutment extending aaeaeoa the upper side of orting said elastic part, said elastic part having its axis of movement parallel to the axis of said hanger, a sliding plate bearing against the lower side of said elastic part, means for transmitting the motion of said blank-holder to said sliding plate, said hanger comprising an abutment at its lower end for sustaining the force in said fulcrum, and an abutment extending from said lower end to the upper side of said elastic art, and means at the lower end of'said anger for adjusting the position of said upper abutment.

18. A drawing press comprising a blankholder, and means for resisting the movement of said blank-holder, said means comprising an elastic art, a hanger for supporting said elastic part, a sliding plate bearing against the lower side of, said elastic part, means for transmitting the motion of said blank-holder to said sliding plate, said means comprising a lever having a shifting fulcrum, whereby the ratio 0 the moments increases in favor of the moving force of the blank-holder with increase of resistance of said elastic body, said hanger comprising an abutment at its lower end for sustaining the force on said fulcrum, a sleeve fastened to the lower end of said hanger, and an abutment on the upper end of said sleeve against which the upper side of said elastic part bears.

In witness whereof, I have hereunto signed my name.

' OCKE. 

